Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 0	$ 0	$ 0	$ 0
Defined Benefit Plan, Interest Cost	232	242	696	726
Defined Benefit Plan, Expected Return on Plan Assets	(176)	(181)	(528)	(543)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Defined Benefit Plan, Amortization of Gains (Losses)	36	14	108	42
Defined Benefit Plan, Other Costs	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	92	75	276	225
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	14	13	43	39
Defined Benefit Plan, Interest Cost	41	45	123	135
Defined Benefit Plan, Expected Return on Plan Assets	(19)	(22)	(57)	(67)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(7)	(1)	(16)	(2)
Defined Benefit Plan, Amortization of Gains (Losses)	6	(3)	18	(9)
Defined Benefit Plan, Other Costs	6	0	110	0
Defined Benefit Plan, Net Periodic Benefit Cost	41	32	221	96
Special Termination Benefits [Member] | United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Other Costs			$ 110